3 66 



THE BRAIN 



when the brain is in position in the cranium. It rests, in 

 the posterior part of its extent, upon the tentorium cerebelli, 

 and, more anteriorly, upon the anterior surface of the petrous 



Olfactory bulb 



.Olfactory tract 



Optic nerve 



Substantiate 

 forata anteric 



Optic tract 



Motor root of 

 facial nerve 

 Acoustic nerve 



Sensory root of 

 facial nerve 



Glosso-pharyngeal 

 nerve 



Hypoglossal 

 nerve 



Pyramid 



Vagus nerve 

 Accessory nerve 



Hypoglossal nerve 



Spinal medulla (cut) 

 FIG. 139. The Base of the Brain with the Cerebral Nerves attached. 



portion of the temporal bone and the great wing of the 

 sphenoid. On account of its relation to the tentorium, it is 

 frequently called the tentorial surface. 



The posterior part of the inferior surface is bounded 



